(also known as Parent/Clone roms, especially in MAME)
I don't mean fullsets in one 7z file, instead of this, I mean some versions of the same game into one file, for instance: Mega Man 3.7z
I think an option that allow the user sets it's own preferences of which versions of the games (s)he wants, for example: (U), (J), (E)... (Tw), (Ch). This makes the program choose first the (U) rom, if doesn't exist, choose the (J)... finishing by the (Ch) rom if it's the only available.
But let's also remember that in the Mega Man 3 example, the (U) rom has PRG0 and PRG1, so it's also well, letting choose which file to rom inside the 7z file before starting, like Nestopia or BizHawk does.
https://s15.postimg.cc/oohvk8ch7/metropolis1.png
Getting back to the preferences method, maybe something like this would be great:
https://s15.postimg.cc/upfkhch3v/metropolis2.png
This is a great idea because this saves time by choosing the best version of every game by the user (him/her)-self, especially if has a full collection of merged roms, saves hours.
(also known as Parent/Clone roms, especially in MAME) I don't mean fullsets in one 7z file, instead of this, I mean some versions of the same game into one file, for instance: Mega Man 3.7z I think an option that allow the user sets it's own preferences of which versions of the games (s)he wants, for example: (U), (J), (E)... (Tw), (Ch). This makes the program choose first the (U) rom, if doesn't exist, choose the (J)... finishing by the (Ch) rom if it's the only available. But let's also remember that in the Mega Man 3 example, the (U) rom has PRG0 and PRG1, so it's also well, letting choose which file to rom inside the 7z file before starting, like Nestopia or BizHawk does. https://s15.postimg.cc/oohvk8ch7/metropolis1.png Getting back to the preferences method, maybe something like this would be great: https://s15.postimg.cc/upfkhch3v/metropolis2.png This is a great idea because this saves time by choosing the best version of every game by the user (him/her)-self, especially if has a full collection of merged roms, saves hours.